linux-kernel - Re: [PATCH v5 1/4] dt-bindings: leds: Add document bindings for leds-mt6323

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Date:   Sun, 12 Mar 2017 09:04:48 -0500
From:   Rob Herring <robh@...nel.org>
To:     sean.wang@...iatek.com
Cc:     rpurdie@...ys.net, jacek.anaszewski@...il.com,
        lee.jones@...aro.org, matthias.bgg@...il.com, pavel@....cz,
        mark.rutland@....com, devicetree@...r.kernel.org,
        linux-leds@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        keyhaede@...il.com
Subject: Re: [PATCH v5 1/4] dt-bindings: leds: Add document bindings for
 leds-mt6323

On Fri, Mar 03, 2017 at 09:56:22PM +0800, sean.wang@...iatek.com wrote:
> From: Sean Wang <sean.wang@...iatek.com>
> 
> This patch adds documentation for devicetree bindings
> for LED support on MT6323 PMIC
> 
> Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> ---
>  .../devicetree/bindings/leds/leds-mt6323.txt       | 63 ++++++++++++++++++++++
>  1 file changed, 63 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-mt6323.txt
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-mt6323.txt b/Documentation/devicetree/bindings/leds/leds-mt6323.txt
> new file mode 100644
> index 0000000..135c441
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-mt6323.txt
> @@ -0,0 +1,63 @@
> +Device Tree Bindings for LED support on MT6323 PMIC
> +
> +MT6323 LED controller is subfunction provided by
> +MT6323 PMIC, so the LED controllers are defined as
> +the subnode of the function node provided by MT6323
> +PMIC controller that is being defined as one kind of
> +Muti-Function Device (MFD) using shared bus called
> +PMIC wrapper for each subfunction to access remote
> +MT6323 PMIC hardware.

Your line wrap is kind of short. Fix you line wrap to 72-80 char.

> +
> +For MT6323 MFD bindings see:
> +Documentation/devicetree/bindings/mfd/mt6397.txt
> +For MediaTek PMIC wrapper bindings see:
> +Documentation/devicetree/bindings/soc/mediatek/pwrap.txt
> +
> +There's sub-node for the LED controller that describes
> +the initial behavior for each LED physically and currently
> +only four LED sub-nodes can be supported.
> +
> +Required properties:
> +- compatible : Must be "mediatek,mt6323-led"
> +- address-cells : Must be 1
> +- size-cells : Must be 0
> +
> +LED sub-node properties:
> +- reg : LED channel number (0..3)
> +- label : (optional)
> +  see Documentation/devicetree/bindings/leds/common.txt
> +- linux,default-trigger : (optional)
> +  see Documentation/devicetree/bindings/leds/common.txt
> +- default-state: (optional) The initial state of the LED
> +  see Documentation/devicetree/bindings/leds/common.txt

Group these by required and optional. You can drop "The initial state of 
the LED".

> +
> +Example:
> +
> +	pmic: mt6323 {

mt6323: pmic {

> +		compatible = "mediatek,mt6323";
> +
> +		...
> +
> +		mt6323led: leds {
> +			compatible = "mediatek,mt6323-led";
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			led@0 {
> +				reg = <0>;
> +				label = "LED0";
> +				linux,default-trigger = "timer";
> +				default-state = "on";
> +			};
> +			led@1 {
> +				reg = <1>;
> +				label = "LED1";
> +				default-state = "off";
> +			};
> +			led@2 {
> +				reg = <2>;
> +				label = "LED2";
> +				default-state = "on";
> +			};
> +		};
> +	};
> -- 
> 1.9.1
>